题目内容
在如图所示的电路中,电源的电动势为 E,内电阻为 r,L 1、L 2是两个小灯泡,闭合S后,两灯均能发光,当滑动变阻器的滑片向右滑动时,会出现( ) 
2021-07-21
A.L1变暗L2变暗
B.L1变亮L2变暗
C.L1变亮L2变亮
D.L1变暗L2变亮
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